Thin-film vanadium dioxide (VO_2) and vanadium sesquioxide (V_2O_3) undergo shear phase transformations at 340 K and 120 K,respectively. The electrical and infrared optical opticla properties of these materials are dramatically impacted by this phase transformation. Below the phase transition temperature, both VO_2 and V_2O_3 are "poor" electrical insulators and have minimal absorption in the infrared spectral region. Above the phase transition temperature, both VO_2 and V_2O_3 are poor conductors and are opaque in the infrared. The infrared thermochromic properties of these materials make them interesting candidates for several optical applications.
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